This pin is Part of the Lanyard Pin Series 3. It features a monorail white in color with a black stripe, and at the bottom, front corner is a "Hidden Mickey" indicating "Cast Lanyard Series." This pin can only be attained by trading with a cast member. There are 4 different colors for the stripes on the pins in the Monorail series. The original pin without the "Hidden Mickey" is Pin #33179. The back is stamped: "Official Pin Trading 2005 Cast Lanyard Series — ©Disney — Made in China". This pin has also been re-released as part of the Hidden Mickey Collection. New backstamp has the 2006 Official Pin Trading logo and is marked Hidden Mickey Pin-2 of 8. Size: 1¼" x ½"